Well obviously a Phenom will be better then a P4, a P4 is comparable to the Sempron and early Athlon X2 series. Anyway, I recommend that you invest a little bit more and buy a motherboard that supports Intel processors. Get the ASUS P5K-VM, it costs less than $100 and supports all of Intel's latest 45nm chips. You cold get a Q6600 for it but if you want something cheaper then go for the Core 2 Duo E6xxx or E7xxx series (the E8xxx costs marginally less then a Q660 so no point of getting that), they're the "cat's meow" when it comes to gaming!
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